= -5 - 37 - 45 + 51 + 37 - 51

= (-5 -45 )+ (37 - 37) + (51 - 51) 

= -50 

\(-5+\left(-37-45+51\right)-\left(-37+51\right)\)

\(=-5-37-45+51+37-51\)

\(=-\left(5+45\right)-\left(37-37\right)+\left(51-51\right)\)

\(=-50-0+0=-50\)

- 5 + ( - 37 - 47 + 51 ) - ( - 37 + 51 ) = - 5 + ( - 33 ) - 14

                                                        =  - 38 - 14 

                                                        = - 52

Chúc bạn học tốt

-5 + ( -37 - 45 + 51 ) - ( -37 + 51 ) 

=-5+ -37 - 45 + 51- -37 + 51 

=(37+(-37) +(51-(-51) + (45 - (-5)

=0+0+50

=50

MIK MỚI LÀM ĐC PHẦN A)

    -5 + (-37 - 45 + 51) - (-37 + 51)

=  -5  - 37 - 45 + 51 + 37 - 51

=  - (5 + 45) - (37 - 37) + (51 - 51)

= - 50 - 0 + 0

= - 50

  - (15 - 47 + 58) + (15 - 47 ) + 3

= - 15 + 47 - 58 + 15 - 47 + 3

= (-15 + 15) + (47 - 47) - (58 - 3)

= 0 + 0 - 55

= - 55

  (53 - 45 - 49) - (53 + 45 - 49)

= 53 -  45 - 49 - 53 - 45 + 49

= (53 - 53) + (-49 + 49) - (45 + 45)

= 0 + 0 - 90

= - 90 

    13 - 15 + 49 - 13 + 15 - 48

=  (13 - 13) + (-15 + 15) + (49 - 48)

= 0 + 0 + 1

=  1 

15+13 -15-13 +49-48

-5 + ( -37 - 45 + 51 ) - ( -37 + 51 ) 

=-5+ -37 - 45 + 51- -37 + 51 

=(37+(-37) +(51-(-51) + (45 - (-5)

=0+0+50

=50

  -5 + ( -37 - 45 + 51 ) - ( -37 + 51 )

=-5 + (-45) + ( -37 + 51 ) - ( -37 + 51 )

=-50

  -(15 - 47 + 58 ) + ( 15 - 47 ) + 3

=-(15 - 47) -58 + (15 - 47 ) + 3

=-58 + 3=-55

`#3107.101107`

\(45\times37+93\times45+55\times61+69\times55\)

\(=45\times\left(37+93\right)+55\times\left(61+69\right)\)

\(=45\times130+55\times130\)

\(=130\times\left(45+55\right)\)

\(=130\times100\)

\(=13000\)

\(#GNamK\)

45x37+93x45+55x61+69x55
=45x(37+93)+55x(61+69)

=45x130+55x130
=130x(45+55)

=130x100=13000

A có (99-17)+1=83 phần tử
Số ở giữa sẽ là 17+(82/2) = 58
Những số khác tạo thành các cặp
A=(17+99) + (18+98)+...+58

A=116*(82/2)+58= 4814
Những bài khác tương tự

f gsegersg sdfreg sẻ

\(x:2+250.4=55.61+69.55-45.37-93.45\)

\(\Leftrightarrow x:2+1000=55\left(61+69\right)-45\left(37+93\right)\)

\(\Leftrightarrow x:2+1000=55.130-45.130\)

\(\Leftrightarrow x:2+1000=130\left(55-45\right)\)

\(\Leftrightarrow x:2+1000=130.10\)

\(\Leftrightarrow x:2+1000=1300\)

\(\Leftrightarrow x:2=1300-1000=300\)

\(\Leftrightarrow x=300.2=600\)

Vậy \(x=600\)

X:2+250*4=55*61+69*55-45*37-93*45

X:2+250*4=(55*61+69*55)-(45*37+93*45)

X:2+1000=55*(61+69)-45*(37+93)

X:2+1000=55*130-45*130

X:2+1000=(55-45)*130

X:2+1000=10*130

X:2+1000=1300

X:2=1300-1000

X:2=300

X=300*2

X=600

Vậy X = 600

a) 28 + 55 = 83

45 + 49 = 94

37 + 53 = 90

b) 61 - 18 = 43

53 - 26 = 27

92 - 84 = 8

\(\begin{array}{*{20}{c}}{a)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{28}\\{55}\end{array}}\\\hline{\,\,\,\,83}\end{array}\)                    \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{45}\\{49}\end{array}}\\\hline{\,\,\,\,94}\end{array}\)                            \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{37}\\{53}\end{array}}\\\hline{\,\,\,\,90}\end{array}\)

\(\begin{array}{*{20}{c}}{b)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{61}\\{18}\end{array}}\\\hline{\,\,\,43}\end{array}\)                    \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{53}\\{26}\end{array}}\\\hline{\,\,\,27}\end{array}\)                           \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{92}\\{84}\end{array}}\\\hline{\,\,\,08}\end{array}\)